Seahawks coach Jim Mora said Monday further tests on the three-time Pro Bowl linebacker’s chest muscle indicated a partial tear rather than a complete one.

Mora says team medical personnel are now examining Tatupu’s relatively healthy pectoral muscle on the right side. They will compare it to the injured left one to further gauge how much damage the left pectoral sustained.

If Monday’s results from the magnetic resonance imaging exam are proven accurate, Tatupu could be back after a few weeks of rehabilitation.

The team’s co-captain was injured while trying to tackle Arizona receiver Larry Fitzgerald in the second quarter of Seattle’s 27-3 loss to the Cardinals on Sunday.